Mitsubishi PUHZ-RP60VHA Service Manual download pdf (Page 55)

(6606)

Communication error with communica-

tion processor

Defective communication between unit

processor and transmission processor

Note) The address and attribute display at

remote controller indicate the con-

troller that detected abnormality.

1 Data of transmission proces-

sor or unit processor is not

transmitted normally because

of accidental trouble such as

noise or thunder surge.

2 Address forwarding from unit

processor is not transmitted

normally because of defective

transmission processor hard-

ware.

Turn off the power supply of outdoor unit,

indoor unit and FRESH MASTER or LOSSNAY

at the same time for 2 minutes or more, and

turn the power on again. System returns nor-

mally if abnormality was accidental malfunction.

If the same abnormality generates again,

abnormality-generated controller may be defec-

tive.

Continued to the next page.

Error Code

Abnormal points and detection method

Case Judgment and action

(6607)

NO ACK signal

1. Transmitting side controller detects

abnormal if a message was transmitted

but there is no reply (ACK) that a mes-

sage was received. Transmitting side

detects abnormality every 30 seconds, 6

times continuously.

Note) The address and attribute displayed

at remote controller indicate the con-

troller that did not reply (ACK).

Common factor that has no rela-

tion with abnormality source

1 The unit of former address

does not exist as address

switch has changed while the

unit was energized.

2 Extinction of transmission wire

voltage and signal is caused

by over-range transmission

wire.

• Maximum distance ······200m

• Remote controller line (12m)

3 Extinction of transmission wire

voltage and signal is caused

by type-unmatched transmis-

sion wire.

Type ······

With shield wire-

CVVS, CPEVS

With normal wire (no shield)-

VCTF, VCTFK, CVV

CVS, VVR, VVF, VCT

Diameter····1.25mm

or more

4 Extinction of transmission wire

voltage and signal is caused

by over-numbered units.

5 Accidental malfunction of

abnormality-detected controller

(noise, thunder surge)

6 Defective of abnormality-gen-

erated controller

2. If displayed address or attribute is out-

door unit, indoor unit detects abnormali-

ty when indoor unit transmits signal to

outdoor unit and there was no reply

(ACK).

1 Contact failure of transmission

wire of outdoor unit or indoor

unit

2 Disconnection of transmission

connector (CN2M) of outdoor

unit

3 Defective transmitting receiv-

ing circuit of outdoor unit or

indoor unit

Always try the followings when the error

“A7” occurs.

1 Turn off the power supply of outdoor unit,

indoor unit and FRESH MASTER or LOSS-

NAY at the same time for 2 minutes or more,

and turn the power on again. If malfunction

was accidental, the unit returns to normal.

2 Check address switch of abnormality-gener-

ated address.

3 Check disconnection or looseness of abnor-

mality-generated or abnormality-detected

transmission wire (terminal block and con-

nector)

4 Check if tolerance range of transmission wire

is not exceeded.

5 Check if type of transmission wire is correct

or not.

If there were some trouble of 1-5 above,

repair the defect, then turn off the power supply

of outdoor unit, indoor unit and FRESH MAS-

TER or LOSSNAY at the same time for 2 min-

utes or more, and turn the power on again.

• If there was no trouble with 1-5 above in sin-

gle refrigerant system (one outdoor unit), con-

troller of displayed address or attribute is

defective.

• If there was no trouble with 1-5 above in dif-

ferent refrigerant system (two or more outdoor

units), judge with 6.

6 If address of abnormality source is the

address that should not exist, there is the

unit that memorizes nonexistent address

information. Delete useless address informa-

tion with manual setting function of remote

controller.

Only the system FRESH MASTER or LOSS-

NAY are connected to, or the system that is

equipped with group setting of different

refrigerant system.

If there was no trouble with 1-6 above,

replace the controller board of displayed

address or attribute.

If the unit does not return normally, multi-con-

troller board of outdoor unit may be defective

(repeater circuit).

Replace multi-controller board one by one to

check if the unit returns normally.

3. If displayed address or attribute is

indoor unit, remote controller detects

abnormality when remote controller

transmits signal to indoor unit and there

was no reply (ACK).

1 During group operation with

indoor unit of multi- refrigerant

system, if remote controller

transmits signal to indoor unit

while outdoor unit power sup-

ply of one refrigerant system is

turned off or within 2 minutes

of restart, abnormality is

detected.

2 Contact failure of transmission

wire of remote controller or

indoor unit

3 Disconnection of transmission

connector (CN2M) of indoor

unit

4 Defective transmitting receiv-

ing circuit of indoor unit or

remote controller

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